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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Christoph Hellwig <hch@lst.de>
Cc: "the arch/x86 maintainers" <x86@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-parisc@vger.kernel.org,
	linux-um <linux-um@lists.infradead.org>,
	Netdev <netdev@vger.kernel.org>,
	bpf@vger.kernel.org, Linux-MM <linux-mm@kvack.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 11/20] bpf: factor out a bpf_trace_copy_string helper
Date: Tue, 19 May 2020 09:07:55 -0700
Message-ID: <CAHk-=wjm3HQy_awVX-WyF6KrSuE1pcFRaNX_XhiLKkBUFUZBtQ@mail.gmail.com> (raw)
In-Reply-To: <20200519134449.1466624-12-hch@lst.de>

On Tue, May 19, 2020 at 6:45 AM Christoph Hellwig <hch@lst.de> wrote:
>
> +       switch (fmt_ptype) {
> +       case 's':
> +#ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
> +               strncpy_from_unsafe(buf, unsafe_ptr, bufsz);
> +               break;
> +#endif
> +       case 'k':
> +               strncpy_from_kernel_nofault(buf, unsafe_ptr, bufsz);
> +               break;

That 's' case needs a "fallthrough;" for the overlapping case,
methinks. Otherwise you'll get warnings.

                  Linus

  reply index

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-19 13:44 clean up and streamline probe_kernel_* and friends v3 Christoph Hellwig
2020-05-19 13:44 ` [PATCH 01/20] maccess: unexport probe_kernel_write and probe_user_write Christoph Hellwig
2020-05-19 13:44 ` [PATCH 02/20] maccess: remove various unused weak aliases Christoph Hellwig
2020-05-19 13:44 ` [PATCH 03/20] maccess: remove duplicate kerneldoc comments Christoph Hellwig
2020-05-19 13:44 ` [PATCH 04/20] maccess: clarify " Christoph Hellwig
2020-05-19 13:44 ` [PATCH 05/20] maccess: update the top of file comment Christoph Hellwig
2020-05-19 13:44 ` [PATCH 06/20] maccess: rename strncpy_from_unsafe_user to strncpy_from_user_nofault Christoph Hellwig
2020-05-19 13:44 ` [PATCH 07/20] maccess: rename strncpy_from_unsafe_strict to strncpy_from_kernel_nofault Christoph Hellwig
2020-05-19 13:44 ` [PATCH 08/20] maccess: rename strnlen_unsafe_user to strnlen_user_nofault Christoph Hellwig
2020-05-19 13:44 ` [PATCH 09/20] maccess: remove probe_read_common and probe_write_common Christoph Hellwig
2020-05-19 13:44 ` [PATCH 10/20] maccess: unify the probe kernel arch hooks Christoph Hellwig
2020-05-19 13:44 ` [PATCH 11/20] bpf: factor out a bpf_trace_copy_string helper Christoph Hellwig
2020-05-19 16:07   ` Linus Torvalds [this message]
2020-05-19 16:14     ` Christoph Hellwig
2020-05-19 16:36       ` Linus Torvalds
2020-05-19 13:44 ` [PATCH 12/20] maccess: remove strncpy_from_unsafe Christoph Hellwig
2020-05-19 16:25   ` Linus Torvalds
2020-05-19 16:41     ` Christoph Hellwig
2020-05-19 16:46       ` Linus Torvalds
2020-05-19 13:44 ` [PATCH 13/20] maccess: always use strict semantics for probe_kernel_read Christoph Hellwig
2020-05-19 16:33   ` Linus Torvalds
2020-05-20 11:11   ` Masami Hiramatsu
2020-05-20 11:13     ` Christoph Hellwig
2020-05-19 13:44 ` [PATCH 14/20] maccess: move user access routines together Christoph Hellwig
2020-05-19 13:44 ` [PATCH 15/20] maccess: allow architectures to provide kernel probing directly Christoph Hellwig
2020-05-19 13:44 ` [PATCH 16/20] x86: use non-set_fs based maccess routines Christoph Hellwig
2020-05-19 13:44 ` [PATCH 17/20] maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault Christoph Hellwig
2020-05-19 13:44 ` [PATCH 18/20] maccess: rename probe_user_{read,write} to copy_{from,to}_user_nofault Christoph Hellwig
2020-05-19 13:44 ` [PATCH 19/20] maccess: rename probe_kernel_address to get_kernel_nofault Christoph Hellwig
2020-05-19 13:44 ` [PATCH 20/20] maccess: return -ERANGE when copy_from_kernel_nofault_allowed fails Christoph Hellwig
2020-05-20 11:02   ` Masami Hiramatsu
2020-05-20 16:16     ` Christoph Hellwig
2020-05-19 16:34 ` clean up and streamline probe_kernel_* and friends v3 Linus Torvalds

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